• "Pretty Little Liars" is a teen drama mystery–thriller television series that premiered on June 8, 2010 on ABC Family and loosely based on the book series of the same title, written by Sara Shepard.

"Pretty Little Liars" is a teen drama mystery–thriller television series that premiered on June 8, 2010 on ABC Family and loosely based on the book series of the same title, written by Sara Shepard. (Photo : Reuters)

A new promo for "Pretty Little Liars" season 6B has been released. Several clues were revealed in the promo. Here are five of them:

1.      There is a new Big Bad.

Indeed, helping Alison DiLaurentis (Sasha Pieterse) only leads to misfortune. The Liars Hanna Marin (Ashley Benson), Spencer Hastings (Troian Bellisario), Aria Montgomery (Lucy Hale) and Emily Fields (Shay Mitchell) start receiving new text messages from a blocked number after Charlotte DiLaurentis' (Vanessa Ray) hearing.

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On Aria Montgomery's phone, the text reads, "You know what you did and I'm going to make you talk."

2.      The new Big Bad is not playing games.

Being held down in a hospital bed, Emily Fields seen may be in big trouble or she is just having a nightmare because of her PTSD.

3.      Melissa Hastings (Torrey DeVitto) returns.

Melissa Hastings drops truth bombs all over Rosewood. She tells Hanna Marin, "We all have a past, Hanna. Aren't you curious what she's going to use against you?"

4.      Hanna Marin and Caleb Rivers (Tyler Blackburn) are not engaged.

The handsome mystery man Hanna Marin is seen kissing is not Caleb Rivers, who appears to be destined to Spencer Hastings.

5.      Ezra Fritz (Ian Harding) is angry.

The Liars were free from A and were away from Rosewood in five years. Ezra Fritz knows that many things can happen in those five years. Aria Montgomery tells him, "I know why you did what you did. Now I will do whatever it takes to help you."

Before the release of the "Pretty Little Liars" season 6B promo, Marlene King told Hollywood Life that the new Big Bad, who "is more lethal," has an agenda and "will not stop at anything" before this agenda is taken care of.  

Meanwhile, the "Pretty Little Liars" showrunner recently revealed to Entertainment Weekly that Leonardo DiCaprio was once originally cast in Brendan Frasier's role as a Vietnam vet.

Watch the "Pretty Little Liars" season 6B promo here: